function getLink()
 {
     $params = $this->buildPostParams();
     require_once ACLOUD_PATH . '/system/core/sys.core.verify.php';
     $params['accesssign'] = ACloud_Sys_Core_Verify::createSignWithOAuth($params);
     require_once ACLOUD_PATH . '/system/core/sys.core.http.php';
     return sprintf("http://%s/index.php?%s", ACLOUD_HOST_API, ACloud_Sys_Core_Http::httpBuildQuery($params));
 }